A quiet winter woodland can suddenly explode with bird life. Jack Laws explains how to tell some of the common species apart.
Native to China, Craspedacusta sowerbii is found in freshwater lakes and ponds on every continent.
Ant lions trap their prey in steep pits.
Watching distant raptors in dim light? Ignore color and look at values.
Life is so surprisingly webbed and interconnected.
Every fall thousands of Vaux’s swifts migrate south, congregating at dusk in swirling flocks. Here’s how to find them when they pass through the Bay Area.
Follow the “kuks” and “quaaas” to find marauding hawks or foxes.
Australian tube worms are now widespread in brackish waters of the San Francisco Bay.
Blue-green algae has made some Bay Area ponds dangerous
What to look for when watching humpbacks.